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Crystal PPM value test method - Database & Sql Blog Articles

Crystal Oscillator
Quartz Oscillator 3225 20M OSC

The CX-118A crystal oscillator tester, developed by Shenzhen Chuangxin Instrument Co., Ltd., is a high-performance device designed for accurate frequency measurement and analysis. It uses a single-chip microcontroller as its core to manage functions, control measurements, and process data efficiently.

By employing reciprocal measurement and counting techniques, the CX-118A ensures precise measurements across a wide range of frequencies. The instrument is equipped with a highly stable crystal oscillator, offering a stability of 5×10⁻⁷ per day, which guarantees reliable and consistent results.

This versatile tool supports multiple measurement functions, including frequency and PPM (parts per million) testing. It can be customized based on user requirements to add specific features that enhance usability and accuracy.

PPM Operation Method:

  1. Press the “▲” (1) or “▼” (2) button until the function indicator “PPM” lights up.
  2. Press the gate button (6) and set the “1s” light to turn on.
  3. Connect the crystal oscillator to the designated socket and secure it in place. The data display window (18) will then show the actual PPM value of the measured crystal.
  4. If the PPM value displays as “0000,” it indicates an incorrect nominal frequency setting. Before proceeding with PPM testing, ensure the correct nominal frequency is set.

PPM Setting Procedure:

  1. Press the parameter key (5) once to enter the crystal center frequency mode.
  2. Press the set button once. The first digit of the display will start flashing, showing the last measured crystal's center frequency (e.g., 32.768KHz).
  3. Enter the standard frequency of the crystal you are measuring.
  4. Press the set button again (6). A specific digit in the display will flash, allowing you to adjust the frequency using the “▲” or “▼” buttons.
  5. Once the desired frequency is set, press the Set button (4) to save the value. The nominal frequency of the current crystal will be displayed.
  6. Finally, press the parameter key (5) to automatically switch to the frequency test function.

Tip:

After saving the settings, press the parameter key once to view the last set center frequency. If the device doesn't respond correctly, press the Set button (4) and follow the steps again to reset the system.

Important Notes and Maintenance:

The CX-118A uses large-scale integrated circuits, so soldering iron tools should not be used during repairs. Always ensure the outer casing of the instrument or other connected devices is properly grounded during calibration to prevent damage from static or electrical surges.

Never operate the device while replacing the fuse. Always disconnect the power cord from the AC mains before performing any maintenance to ensure your safety.

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